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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REQUEST_MANAGER_H_
#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REQUEST_MANAGER_H_
#include <map>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/files/file.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "chrome/browser/chromeos/file_system_provider/notification_manager_interface.h"
#include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
#include "chrome/browser/chromeos/file_system_provider/request_value.h"
namespace chromeos {
namespace file_system_provider {
// Request type, passed to RequestManager::CreateRequest. For logging purposes.
enum RequestType {
REQUEST_UNMOUNT,
GET_METADATA,
READ_DIRECTORY,
OPEN_FILE,
CLOSE_FILE,
READ_FILE,
CREATE_DIRECTORY,
DELETE_ENTRY,
CREATE_FILE,
COPY_ENTRY,
MOVE_ENTRY,
TRUNCATE,
WRITE_FILE,
ABORT,
ADD_WATCHER,
REMOVE_WATCHER,
TESTING
};
// Converts a request type to human-readable format.
std::string RequestTypeToString(RequestType type);
// Manages requests between the service, async utils and the providing
// extensions.
class RequestManager {
public:
// Handles requests. Each request implementation must implement
// this interface.
class HandlerInterface {
public:
virtual ~HandlerInterface() {}
// Called when the request is created. Executes the request implementation.
// Returns false in case of a execution failure.
virtual bool Execute(int request_id) = 0;
// Success callback invoked by the providing extension in response to
// Execute(). It may be called more than once, until |has_more| is set to
// false.
virtual void OnSuccess(int request_id,
scoped_ptr<RequestValue> result,
bool has_more) = 0;
// Error callback invoked by the providing extension in response to
// Execute(). It can be called at most once. It can be also called if the
// request is aborted due to a timeout.
virtual void OnError(int request_id,
scoped_ptr<RequestValue> result,
base::File::Error error) = 0;
};
// Observes activities in the request manager.
class Observer {
public:
virtual ~Observer() {}
// Called when the request is created.
virtual void OnRequestCreated(int request_id, RequestType type) = 0;
// Called when the request is destroyed.
virtual void OnRequestDestroyed(int request_id) = 0;
// Called when the request is executed.
virtual void OnRequestExecuted(int request_id) = 0;
// Called when the request is fulfilled with a success.
virtual void OnRequestFulfilled(int request_id,
const RequestValue& result,
bool has_more) = 0;
// Called when the request is rejected with an error.
virtual void OnRequestRejected(int request_id,
const RequestValue& result,
base::File::Error error) = 0;
// Called when the request is timeouted.
virtual void OnRequestTimeouted(int request_id) = 0;
};
explicit RequestManager(NotificationManagerInterface* notification_manager);
virtual ~RequestManager();
// Creates a request and returns its request id (greater than 0). Returns 0 in
// case of an error (eg. too many requests). The |type| argument indicates
// what kind of request it is.
int CreateRequest(RequestType type, scoped_ptr<HandlerInterface> handler);
// Handles successful response for the |request_id|. If |has_more| is false,
// then the request is disposed, after handling the |response|. On success,
// returns base::File::FILE_OK. Otherwise returns an error code. |response|
// must not be NULL.
base::File::Error FulfillRequest(int request_id,
scoped_ptr<RequestValue> response,
bool has_more);
// Handles error response for the |request_id|. If handling the error
// succeeds, theen returns base::File::FILE_OK. Otherwise returns an error
// code. Always disposes the request. |response| must not be NULL.
base::File::Error RejectRequest(int request_id,
scoped_ptr<RequestValue> response,
base::File::Error error);
// Sets a custom timeout for tests. The new timeout value will be applied to
// new requests
void SetTimeoutForTesting(const base::TimeDelta& timeout);
// Gets list of active request ids.
std::vector<int> GetActiveRequestIds() const;
// Adds and removes observers.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
private:
struct Request {
Request();
~Request();
// Timer for discarding the request during a timeout.
base::OneShotTimer<RequestManager> timeout_timer;
// Handler tied to this request.
scoped_ptr<HandlerInterface> handler;
private:
DISALLOW_COPY_AND_ASSIGN(Request);
};
typedef std::map<int, Request*> RequestMap;
// Destroys the request with the passed |request_id|.
void DestroyRequest(int request_id);
// Called when a request with |request_id| timeouts.
void OnRequestTimeout(int request_id);
// Called when an user either aborts the unresponsive request or lets it
// continue.
void OnUnresponsiveNotificationResult(
int request_id,
NotificationManagerInterface::NotificationResult result);
// Resets the timeout timer for the specified request.
void ResetTimer(int request_id);
RequestMap requests_;
NotificationManagerInterface* notification_manager_; // Not owned.
int next_id_;
base::TimeDelta timeout_;
ObserverList<Observer> observers_;
base::WeakPtrFactory<RequestManager> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(RequestManager);
};
} // namespace file_system_provider
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_REQUEST_MANAGER_H_
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